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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: KeyRange.html 939 2015-05-29 01:16:17Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.kv;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.primitives.Bytes;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Arrays;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.Comparator;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.jsimpledb.util.ByteUtil;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.util.SizeEstimating;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.jsimpledb.util.SizeEstimator;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>/**<a name="line.19"></a>
<span class="sourceLineNo">020</span> * Represents a contiguous range of {@code byte[]} keys, when keys are sorted in unsigned lexical order.<a name="line.20"></a>
<span class="sourceLineNo">021</span> * Instances are defined by an inclusive lower bound and an exclusive upper bound.<a name="line.21"></a>
<span class="sourceLineNo">022</span> * The upper bound may be specified as null to represent no maximum.<a name="line.22"></a>
<span class="sourceLineNo">023</span> *<a name="line.23"></a>
<span class="sourceLineNo">024</span> * &lt;p&gt;<a name="line.24"></a>
<span class="sourceLineNo">025</span> * Instances are immutable: the minimum and maximum {@code byte[]} arrays are copied during<a name="line.25"></a>
<span class="sourceLineNo">026</span> * construction and when accessed by {@link #getMin} and {@link #getMax}.<a name="line.26"></a>
<span class="sourceLineNo">027</span> * &lt;/p&gt;<a name="line.27"></a>
<span class="sourceLineNo">028</span> */<a name="line.28"></a>
<span class="sourceLineNo">029</span>public class KeyRange implements SizeEstimating {<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>    /**<a name="line.31"></a>
<span class="sourceLineNo">032</span>     * The {@link KeyRange} containing the full range (i.e., all keys).<a name="line.32"></a>
<span class="sourceLineNo">033</span>     */<a name="line.33"></a>
<span class="sourceLineNo">034</span>    public static final KeyRange FULL = new KeyRange(ByteUtil.EMPTY, null);<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>    /**<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * Sorts instances by {@linkplain KeyRange#getMin min value}, then {@linkplain KeyRange#getMax max value}.<a name="line.37"></a>
<span class="sourceLineNo">038</span>     */<a name="line.38"></a>
<span class="sourceLineNo">039</span>    public static final Comparator&lt;KeyRange&gt; SORT_BY_MIN = new Comparator&lt;KeyRange&gt;() {<a name="line.39"></a>
<span class="sourceLineNo">040</span>        @Override<a name="line.40"></a>
<span class="sourceLineNo">041</span>        public int compare(KeyRange keyRange1, KeyRange keyRange2) {<a name="line.41"></a>
<span class="sourceLineNo">042</span>            int diff = ByteUtil.compare(keyRange1.min, keyRange2.min);<a name="line.42"></a>
<span class="sourceLineNo">043</span>            if (diff != 0)<a name="line.43"></a>
<span class="sourceLineNo">044</span>                return diff;<a name="line.44"></a>
<span class="sourceLineNo">045</span>            diff = KeyRange.compare(keyRange1.max, keyRange2.max);<a name="line.45"></a>
<span class="sourceLineNo">046</span>            if (diff != 0)<a name="line.46"></a>
<span class="sourceLineNo">047</span>                return diff;<a name="line.47"></a>
<span class="sourceLineNo">048</span>            return 0;<a name="line.48"></a>
<span class="sourceLineNo">049</span>        }<a name="line.49"></a>
<span class="sourceLineNo">050</span>    };<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span>    /**<a name="line.52"></a>
<span class="sourceLineNo">053</span>     * Sorts instances by {@linkplain KeyRange#getMax max value}, then {@linkplain KeyRange#getMin min value}.<a name="line.53"></a>
<span class="sourceLineNo">054</span>     */<a name="line.54"></a>
<span class="sourceLineNo">055</span>    public static final Comparator&lt;KeyRange&gt; SORT_BY_MAX = new Comparator&lt;KeyRange&gt;() {<a name="line.55"></a>
<span class="sourceLineNo">056</span>        @Override<a name="line.56"></a>
<span class="sourceLineNo">057</span>        public int compare(KeyRange keyRange1, KeyRange keyRange2) {<a name="line.57"></a>
<span class="sourceLineNo">058</span>            int diff = KeyRange.compare(keyRange1.max, keyRange2.max);<a name="line.58"></a>
<span class="sourceLineNo">059</span>            if (diff != 0)<a name="line.59"></a>
<span class="sourceLineNo">060</span>                return diff;<a name="line.60"></a>
<span class="sourceLineNo">061</span>            diff = ByteUtil.compare(keyRange1.min, keyRange2.min);<a name="line.61"></a>
<span class="sourceLineNo">062</span>            if (diff != 0)<a name="line.62"></a>
<span class="sourceLineNo">063</span>                return diff;<a name="line.63"></a>
<span class="sourceLineNo">064</span>            return 0;<a name="line.64"></a>
<span class="sourceLineNo">065</span>        }<a name="line.65"></a>
<span class="sourceLineNo">066</span>    };<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span>    /**<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * Lower bound (inclusive), or null for no minimum. Subclasses must &lt;b&gt;not&lt;/b&gt; modify the array (to preserve immutability).<a name="line.69"></a>
<span class="sourceLineNo">070</span>     */<a name="line.70"></a>
<span class="sourceLineNo">071</span>    protected final byte[] min;<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span>    /**<a name="line.73"></a>
<span class="sourceLineNo">074</span>     * Upper bound (exclusive), or null for no maximum. Subclasses must &lt;b&gt;not&lt;/b&gt; modify the array (to preserve immutability).<a name="line.74"></a>
<span class="sourceLineNo">075</span>     */<a name="line.75"></a>
<span class="sourceLineNo">076</span>    protected final byte[] max;<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span>// Constructors<a name="line.78"></a>
<span class="sourceLineNo">079</span><a name="line.79"></a>
<span class="sourceLineNo">080</span>    /**<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * Constructor.<a name="line.81"></a>
<span class="sourceLineNo">082</span>     *<a name="line.82"></a>
<span class="sourceLineNo">083</span>     * @param min minimum key (inclusive); must not be null<a name="line.83"></a>
<span class="sourceLineNo">084</span>     * @param max maximum key (exclusive), or null for no maximum<a name="line.84"></a>
<span class="sourceLineNo">085</span>     * @throws IllegalArgumentException if {@code min} is null<a name="line.85"></a>
<span class="sourceLineNo">086</span>     * @throws IllegalArgumentException if {@code min &gt; max}<a name="line.86"></a>
<span class="sourceLineNo">087</span>     */<a name="line.87"></a>
<span class="sourceLineNo">088</span>    public KeyRange(byte[] min, byte[] max) {<a name="line.88"></a>
<span class="sourceLineNo">089</span>        if (min == null)<a name="line.89"></a>
<span class="sourceLineNo">090</span>            throw new IllegalArgumentException("null min");<a name="line.90"></a>
<span class="sourceLineNo">091</span>        if (KeyRange.compare(min, max) &gt; 0)<a name="line.91"></a>
<span class="sourceLineNo">092</span>            throw new IllegalArgumentException("min = " + ByteUtil.toString(min) + " &gt; max = " + ByteUtil.toString(max));<a name="line.92"></a>
<span class="sourceLineNo">093</span>        this.min = min.clone();<a name="line.93"></a>
<span class="sourceLineNo">094</span>        this.max = max != null ? max.clone() : null;<a name="line.94"></a>
<span class="sourceLineNo">095</span>    }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>    /**<a name="line.97"></a>
<span class="sourceLineNo">098</span>     * Construct key range containing a single key.<a name="line.98"></a>
<span class="sourceLineNo">099</span>     *<a name="line.99"></a>
<span class="sourceLineNo">100</span>     * @param key the key contained in the range<a name="line.100"></a>
<span class="sourceLineNo">101</span>     * @throws IllegalArgumentException if {@code key} is null<a name="line.101"></a>
<span class="sourceLineNo">102</span>     */<a name="line.102"></a>
<span class="sourceLineNo">103</span>    public KeyRange(byte[] key) {<a name="line.103"></a>
<span class="sourceLineNo">104</span>        if (key == null)<a name="line.104"></a>
<span class="sourceLineNo">105</span>            throw new IllegalArgumentException("null key");<a name="line.105"></a>
<span class="sourceLineNo">106</span>        this.min = key.clone();<a name="line.106"></a>
<span class="sourceLineNo">107</span>        this.max = ByteUtil.getNextKey(this.min);<a name="line.107"></a>
<span class="sourceLineNo">108</span>    }<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>    /**<a name="line.110"></a>
<span class="sourceLineNo">111</span>     * Construct an instance containing all keys with the given prefix.<a name="line.111"></a>
<span class="sourceLineNo">112</span>     *<a name="line.112"></a>
<span class="sourceLineNo">113</span>     * @param prefix prefix of all keys in the range<a name="line.113"></a>
<span class="sourceLineNo">114</span>     * @return range of keys prefixed by {@code prefix}<a name="line.114"></a>
<span class="sourceLineNo">115</span>     * @throws IllegalArgumentException if {@code prefix} is null<a name="line.115"></a>
<span class="sourceLineNo">116</span>     */<a name="line.116"></a>
<span class="sourceLineNo">117</span>    public static KeyRange forPrefix(byte[] prefix) {<a name="line.117"></a>
<span class="sourceLineNo">118</span>        if (prefix == null)<a name="line.118"></a>
<span class="sourceLineNo">119</span>            throw new IllegalArgumentException("null prefix");<a name="line.119"></a>
<span class="sourceLineNo">120</span>        if (prefix.length == 0)<a name="line.120"></a>
<span class="sourceLineNo">121</span>            return KeyRange.FULL;<a name="line.121"></a>
<span class="sourceLineNo">122</span>        /*final*/ byte[] maxKey;<a name="line.122"></a>
<span class="sourceLineNo">123</span>        try {<a name="line.123"></a>
<span class="sourceLineNo">124</span>            maxKey = ByteUtil.getKeyAfterPrefix(prefix);<a name="line.124"></a>
<span class="sourceLineNo">125</span>        } catch (IllegalArgumentException e) {<a name="line.125"></a>
<span class="sourceLineNo">126</span>            maxKey = null;<a name="line.126"></a>
<span class="sourceLineNo">127</span>        }<a name="line.127"></a>
<span class="sourceLineNo">128</span>        return new KeyRange(prefix, maxKey);<a name="line.128"></a>
<span class="sourceLineNo">129</span>    }<a name="line.129"></a>
<span class="sourceLineNo">130</span><a name="line.130"></a>
<span class="sourceLineNo">131</span>// Instance Methods<a name="line.131"></a>
<span class="sourceLineNo">132</span><a name="line.132"></a>
<span class="sourceLineNo">133</span>    /**<a name="line.133"></a>
<span class="sourceLineNo">134</span>     * Get range minimum (inclusive).<a name="line.134"></a>
<span class="sourceLineNo">135</span>     *<a name="line.135"></a>
<span class="sourceLineNo">136</span>     * @return inclusivie minimum, never null<a name="line.136"></a>
<span class="sourceLineNo">137</span>     */<a name="line.137"></a>
<span class="sourceLineNo">138</span>    public byte[] getMin() {<a name="line.138"></a>
<span class="sourceLineNo">139</span>        return this.min.clone();<a name="line.139"></a>
<span class="sourceLineNo">140</span>    }<a name="line.140"></a>
<span class="sourceLineNo">141</span><a name="line.141"></a>
<span class="sourceLineNo">142</span>    /**<a name="line.142"></a>
<span class="sourceLineNo">143</span>     * Get range maximum (exclusive), or null if there is no upper bound.<a name="line.143"></a>
<span class="sourceLineNo">144</span>     *<a name="line.144"></a>
<span class="sourceLineNo">145</span>     * @return exclusivie maximum, or null for none<a name="line.145"></a>
<span class="sourceLineNo">146</span>     */<a name="line.146"></a>
<span class="sourceLineNo">147</span>    public byte[] getMax() {<a name="line.147"></a>
<span class="sourceLineNo">148</span>        return this.max == null ? null : this.max.clone();<a name="line.148"></a>
<span class="sourceLineNo">149</span>    }<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>    /**<a name="line.151"></a>
<span class="sourceLineNo">152</span>     * Determine if this key range overlaps the specified key range.<a name="line.152"></a>
<span class="sourceLineNo">153</span>     *<a name="line.153"></a>
<span class="sourceLineNo">154</span>     * @param range other instance<a name="line.154"></a>
<span class="sourceLineNo">155</span>     * @return true if this instance overlaps {@code range}<a name="line.155"></a>
<span class="sourceLineNo">156</span>     * @throws IllegalArgumentException if {@code range} is null<a name="line.156"></a>
<span class="sourceLineNo">157</span>     */<a name="line.157"></a>
<span class="sourceLineNo">158</span>    public boolean overlaps(KeyRange range) {<a name="line.158"></a>
<span class="sourceLineNo">159</span>        if (range == null)<a name="line.159"></a>
<span class="sourceLineNo">160</span>            throw new IllegalArgumentException("null range");<a name="line.160"></a>
<span class="sourceLineNo">161</span>        return KeyRange.compare(this.min, range.max) &lt; 0 &amp;&amp; KeyRange.compare(range.min, this.max) &lt; 0;<a name="line.161"></a>
<span class="sourceLineNo">162</span>    }<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>    /**<a name="line.164"></a>
<span class="sourceLineNo">165</span>     * Determine if this key range fully contains the specified key range.<a name="line.165"></a>
<span class="sourceLineNo">166</span>     *<a name="line.166"></a>
<span class="sourceLineNo">167</span>     * @param range other instance<a name="line.167"></a>
<span class="sourceLineNo">168</span>     * @return true if this instance contains {@code range}<a name="line.168"></a>
<span class="sourceLineNo">169</span>     * @throws IllegalArgumentException if {@code range} is null<a name="line.169"></a>
<span class="sourceLineNo">170</span>     */<a name="line.170"></a>
<span class="sourceLineNo">171</span>    public boolean contains(KeyRange range) {<a name="line.171"></a>
<span class="sourceLineNo">172</span>        if (range == null)<a name="line.172"></a>
<span class="sourceLineNo">173</span>            throw new IllegalArgumentException("null range");<a name="line.173"></a>
<span class="sourceLineNo">174</span>        return KeyRange.compare(this.min, range.min) &lt;= 0 &amp;&amp; KeyRange.compare(this.max, range.max) &gt;= 0;<a name="line.174"></a>
<span class="sourceLineNo">175</span>    }<a name="line.175"></a>
<span class="sourceLineNo">176</span><a name="line.176"></a>
<span class="sourceLineNo">177</span>    /**<a name="line.177"></a>
<span class="sourceLineNo">178</span>     * Determine if this key range contains the specified key.<a name="line.178"></a>
<span class="sourceLineNo">179</span>     *<a name="line.179"></a>
<span class="sourceLineNo">180</span>     * @param key key to test<a name="line.180"></a>
<span class="sourceLineNo">181</span>     * @return true if this range contains {@code key}<a name="line.181"></a>
<span class="sourceLineNo">182</span>     * @throws IllegalArgumentException if {@code key} is null<a name="line.182"></a>
<span class="sourceLineNo">183</span>     */<a name="line.183"></a>
<span class="sourceLineNo">184</span>    public boolean contains(byte[] key) {<a name="line.184"></a>
<span class="sourceLineNo">185</span>        return this.compareTo(key) == 0;<a name="line.185"></a>
<span class="sourceLineNo">186</span>    }<a name="line.186"></a>
<span class="sourceLineNo">187</span><a name="line.187"></a>
<span class="sourceLineNo">188</span>    /**<a name="line.188"></a>
<span class="sourceLineNo">189</span>     * Determine whether this instance contains the full range covering all keys.<a name="line.189"></a>
<span class="sourceLineNo">190</span>     *<a name="line.190"></a>
<span class="sourceLineNo">191</span>     * @return true if this instance contains all keys<a name="line.191"></a>
<span class="sourceLineNo">192</span>     */<a name="line.192"></a>
<span class="sourceLineNo">193</span>    public boolean isFull() {<a name="line.193"></a>
<span class="sourceLineNo">194</span>        return this.min.length == 0 &amp;&amp; this.max == null;<a name="line.194"></a>
<span class="sourceLineNo">195</span>    }<a name="line.195"></a>
<span class="sourceLineNo">196</span><a name="line.196"></a>
<span class="sourceLineNo">197</span>    /**<a name="line.197"></a>
<span class="sourceLineNo">198</span>     * Determine whether this instance contains exactly one key.<a name="line.198"></a>
<span class="sourceLineNo">199</span>     *<a name="line.199"></a>
<span class="sourceLineNo">200</span>     * &lt;p&gt;<a name="line.200"></a>
<span class="sourceLineNo">201</span>     * If so, {@link #getMin} returns the key.<a name="line.201"></a>
<span class="sourceLineNo">202</span>     * &lt;/p&gt;<a name="line.202"></a>
<span class="sourceLineNo">203</span>     *<a name="line.203"></a>
<span class="sourceLineNo">204</span>     * @return true if this instance contains exactly one key, otherwise false<a name="line.204"></a>
<span class="sourceLineNo">205</span>     */<a name="line.205"></a>
<span class="sourceLineNo">206</span>    public boolean isSingleKey() {<a name="line.206"></a>
<span class="sourceLineNo">207</span>        return this.max != null &amp;&amp; this.max.length == this.min.length + 1 &amp;&amp; this.max[this.min.length] == 0;<a name="line.207"></a>
<span class="sourceLineNo">208</span>    }<a name="line.208"></a>
<span class="sourceLineNo">209</span><a name="line.209"></a>
<span class="sourceLineNo">210</span>    /**<a name="line.210"></a>
<span class="sourceLineNo">211</span>     * Determine whether this instance contains zero keys (implying {@link #getMin}{@code == }{@link #getMax}).<a name="line.211"></a>
<span class="sourceLineNo">212</span>     *<a name="line.212"></a>
<span class="sourceLineNo">213</span>     * @return true if this instance contains no keys<a name="line.213"></a>
<span class="sourceLineNo">214</span>     */<a name="line.214"></a>
<span class="sourceLineNo">215</span>    public boolean isEmpty() {<a name="line.215"></a>
<span class="sourceLineNo">216</span>        return this.max != null &amp;&amp; ByteUtil.compare(this.min, this.max) == 0;<a name="line.216"></a>
<span class="sourceLineNo">217</span>    }<a name="line.217"></a>
<span class="sourceLineNo">218</span><a name="line.218"></a>
<span class="sourceLineNo">219</span>    /**<a name="line.219"></a>
<span class="sourceLineNo">220</span>     * Create a new instance whose minimum and maximum keys are the same as this instance's<a name="line.220"></a>
<span class="sourceLineNo">221</span>     * but with the given byte sequence prepended.<a name="line.221"></a>
<span class="sourceLineNo">222</span>     *<a name="line.222"></a>
<span class="sourceLineNo">223</span>     * @param prefix key range prefix<a name="line.223"></a>
<span class="sourceLineNo">224</span>     * @return this range prefixed by {@code prefix}<a name="line.224"></a>
<span class="sourceLineNo">225</span>     * @throws IllegalArgumentException if {@code prefix} is null<a name="line.225"></a>
<span class="sourceLineNo">226</span>     */<a name="line.226"></a>
<span class="sourceLineNo">227</span>    public KeyRange prefixedBy(byte[] prefix) {<a name="line.227"></a>
<span class="sourceLineNo">228</span>        if (prefix == null)<a name="line.228"></a>
<span class="sourceLineNo">229</span>            throw new IllegalArgumentException("null prefix");<a name="line.229"></a>
<span class="sourceLineNo">230</span>        final byte[] prefixedMin = Bytes.concat(prefix, this.min);<a name="line.230"></a>
<span class="sourceLineNo">231</span>        /*final*/ byte[] prefixedMax;<a name="line.231"></a>
<span class="sourceLineNo">232</span>        if (this.max != null)<a name="line.232"></a>
<span class="sourceLineNo">233</span>            prefixedMax = Bytes.concat(prefix, this.max);<a name="line.233"></a>
<span class="sourceLineNo">234</span>        else {<a name="line.234"></a>
<span class="sourceLineNo">235</span>            try {<a name="line.235"></a>
<span class="sourceLineNo">236</span>                prefixedMax = ByteUtil.getKeyAfterPrefix(prefix);<a name="line.236"></a>
<span class="sourceLineNo">237</span>            } catch (IllegalArgumentException e) {<a name="line.237"></a>
<span class="sourceLineNo">238</span>                prefixedMax = null;<a name="line.238"></a>
<span class="sourceLineNo">239</span>            }<a name="line.239"></a>
<span class="sourceLineNo">240</span>        }<a name="line.240"></a>
<span class="sourceLineNo">241</span>        return new KeyRange(prefixedMin, prefixedMax);<a name="line.241"></a>
<span class="sourceLineNo">242</span>    }<a name="line.242"></a>
<span class="sourceLineNo">243</span><a name="line.243"></a>
<span class="sourceLineNo">244</span>    /**<a name="line.244"></a>
<span class="sourceLineNo">245</span>     * Determine if this range is left of, contains, or is right of the given key.<a name="line.245"></a>
<span class="sourceLineNo">246</span>     *<a name="line.246"></a>
<span class="sourceLineNo">247</span>     * @param key key for comparison<a name="line.247"></a>
<span class="sourceLineNo">248</span>     * @return -1 if this range is left of {@code key},<a name="line.248"></a>
<span class="sourceLineNo">249</span>     *  0 if this range contains {@code key}, or 1 if this range is right of {@code key},<a name="line.249"></a>
<span class="sourceLineNo">250</span>     * @throws IllegalArgumentException if {@code key} is null<a name="line.250"></a>
<span class="sourceLineNo">251</span>     */<a name="line.251"></a>
<span class="sourceLineNo">252</span>    public int compareTo(byte[] key) {<a name="line.252"></a>
<span class="sourceLineNo">253</span>        if (key == null)<a name="line.253"></a>
<span class="sourceLineNo">254</span>            throw new IllegalArgumentException("null key");<a name="line.254"></a>
<span class="sourceLineNo">255</span>        if (KeyRange.compare(this.min, key) &gt; 0)<a name="line.255"></a>
<span class="sourceLineNo">256</span>            return 1;<a name="line.256"></a>
<span class="sourceLineNo">257</span>        if (KeyRange.compare(this.max, key) &lt;= 0)<a name="line.257"></a>
<span class="sourceLineNo">258</span>            return -1;<a name="line.258"></a>
<span class="sourceLineNo">259</span>        return 0;<a name="line.259"></a>
<span class="sourceLineNo">260</span>    }<a name="line.260"></a>
<span class="sourceLineNo">261</span><a name="line.261"></a>
<span class="sourceLineNo">262</span>    /**<a name="line.262"></a>
<span class="sourceLineNo">263</span>     * Compare two {@code byte[]} keys using unsigned lexical ordering, while also accepting<a name="line.263"></a>
<span class="sourceLineNo">264</span>     * null values that represent "positive infinity".<a name="line.264"></a>
<span class="sourceLineNo">265</span>     *<a name="line.265"></a>
<span class="sourceLineNo">266</span>     * @param key1 first key<a name="line.266"></a>
<span class="sourceLineNo">267</span>     * @param key2 second key<a name="line.267"></a>
<span class="sourceLineNo">268</span>     * @return -1 if {@code key1 &lt; key2}, 1 if {@code key1 &gt; key2}, or zero if {@code key1 = key2}<a name="line.268"></a>
<span class="sourceLineNo">269</span>     */<a name="line.269"></a>
<span class="sourceLineNo">270</span>    public static int compare(byte[] key1, byte[] key2) {<a name="line.270"></a>
<span class="sourceLineNo">271</span>        if (key1 == null &amp;&amp; key2 == null)<a name="line.271"></a>
<span class="sourceLineNo">272</span>            return 0;<a name="line.272"></a>
<span class="sourceLineNo">273</span>        if (key1 == null)<a name="line.273"></a>
<span class="sourceLineNo">274</span>            return 1;<a name="line.274"></a>
<span class="sourceLineNo">275</span>        if (key2 == null)<a name="line.275"></a>
<span class="sourceLineNo">276</span>            return -1;<a name="line.276"></a>
<span class="sourceLineNo">277</span>        return ByteUtil.compare(key1, key2);<a name="line.277"></a>
<span class="sourceLineNo">278</span>    }<a name="line.278"></a>
<span class="sourceLineNo">279</span><a name="line.279"></a>
<span class="sourceLineNo">280</span>// SizeEstimating<a name="line.280"></a>
<span class="sourceLineNo">281</span><a name="line.281"></a>
<span class="sourceLineNo">282</span>    @Override<a name="line.282"></a>
<span class="sourceLineNo">283</span>    public void addTo(SizeEstimator estimator) {<a name="line.283"></a>
<span class="sourceLineNo">284</span>        estimator<a name="line.284"></a>
<span class="sourceLineNo">285</span>          .addObjectOverhead()<a name="line.285"></a>
<span class="sourceLineNo">286</span>          .addField(this.min)<a name="line.286"></a>
<span class="sourceLineNo">287</span>          .addField(this.max);<a name="line.287"></a>
<span class="sourceLineNo">288</span>    }<a name="line.288"></a>
<span class="sourceLineNo">289</span><a name="line.289"></a>
<span class="sourceLineNo">290</span>// Object<a name="line.290"></a>
<span class="sourceLineNo">291</span><a name="line.291"></a>
<span class="sourceLineNo">292</span>    @Override<a name="line.292"></a>
<span class="sourceLineNo">293</span>    public boolean equals(Object obj) {<a name="line.293"></a>
<span class="sourceLineNo">294</span>        if (obj == this)<a name="line.294"></a>
<span class="sourceLineNo">295</span>            return true;<a name="line.295"></a>
<span class="sourceLineNo">296</span>        if (obj == null || obj.getClass() != this.getClass())<a name="line.296"></a>
<span class="sourceLineNo">297</span>            return false;<a name="line.297"></a>
<span class="sourceLineNo">298</span>        final KeyRange that = (KeyRange)obj;<a name="line.298"></a>
<span class="sourceLineNo">299</span>        return Arrays.equals(this.min, that.min) &amp;&amp; (this.max == null ? that.max == null : Arrays.equals(this.max, that.max));<a name="line.299"></a>
<span class="sourceLineNo">300</span>    }<a name="line.300"></a>
<span class="sourceLineNo">301</span><a name="line.301"></a>
<span class="sourceLineNo">302</span>    @Override<a name="line.302"></a>
<span class="sourceLineNo">303</span>    public int hashCode() {<a name="line.303"></a>
<span class="sourceLineNo">304</span>        return Arrays.hashCode(this.min) ^ (this.max != null ? Arrays.hashCode(this.max) : 0);<a name="line.304"></a>
<span class="sourceLineNo">305</span>    }<a name="line.305"></a>
<span class="sourceLineNo">306</span><a name="line.306"></a>
<span class="sourceLineNo">307</span>    @Override<a name="line.307"></a>
<span class="sourceLineNo">308</span>    public String toString() {<a name="line.308"></a>
<span class="sourceLineNo">309</span>        return this.getClass().getSimpleName() + "[" + ByteUtil.toString(this.min) + "," + ByteUtil.toString(this.max) + "]";<a name="line.309"></a>
<span class="sourceLineNo">310</span>    }<a name="line.310"></a>
<span class="sourceLineNo">311</span>}<a name="line.311"></a>
<span class="sourceLineNo">312</span><a name="line.312"></a>




























































</pre>
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